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4.5.4 Unary Adding Operators
unary adding operators + (identity) and - (negation) are predefined for
every specific numeric type T
with their conventional meaning.
They have the following specifications:
function "+"(Right : T) return T
function "-"(Right : T) return T
16 For modular integer
types, the unary adding operator -, when given a nonzero operand, returns
the result of subtracting the value of the operand from the modulus;
for a zero operand, the result is zero.
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